Ch. 1.6 & 1.7 Angles

RAYS 4 Have an end point and go on forever in one direction FH Name: starting point 1 st, then another point 2 nd Ex:

Definition of an angle 4 two rays with a common endpoint, called the vertex vertex ray

Angles and Points 4 Angles can have points in the interior, in the exterior or on the angle.

Three points on the angle The vertex A number Naming Angles

Using three points 4 The vertex point MUST be the middle letter <CBA or <ABC

Using Vertex 4 Must be the vertex of ONLY ONE angle 4 Ex: <B

Using a number 4 A number written inside the angle close to the vertex AND the number is not the measurement 4 Ex: <2

Angle Addition Postulate l m<1 means the measure of <1 l m<1 + m<2=? m<ADC = 58 . m<1 + m<2 = m<ADC

Angle Bisector 4 An interior ray of an angle splits the angle into two congruent angles 4 Since <4  <6, then is an angle bisector.

Example 4 Draw your own diagram and answer this question: 4 If is an angle bisector of <PMY and m<PML = 87 , then find: 4 m<PMY = _______ 4 m<LMY = _______